after replacing the headphone module which i purchased from this web only the left side of my headphones work. which was the same problem before doing the replacement. i have tried various headphones and only one side of the headphones work, i tried using them in other devices and they worked fine. any suggestions?

That is usually going to be the headphone board, but I have seen in a couple of cases it being a problem with the connector on the logic board. You may want to try another headphone board first, but the only other thing it could be is a damaged cable or the logic board.